Baker Hughes Masoneilan SVIII AP, Руководство по установке и обслуживанию

Страница: 77 / 204

Masoneilan SVI II AP Installation and Maintenance Manual =
|
77
© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
Tight Shutoff
Tight Shutoff is an optional performance feature that prevents leakage at the closed position.
Without this feature, at the closed position with an input signal of 0%, the valve may not be
forced tight against the seat with maximum available actuator force or it may be only
touching the seat with minimum force. In either case, it is under control.
To prevent leakage that can occur in the second case, configure TS ON and set a value of
position setpoint below which the actuator applies maximum seating force. As the position
signal drops toward the TS value, SVI II AP moves the valve to the TS position value. When the
position reaches the TS value SVI II AP applies maximum actuator force.
The TS function has 0.5% deadband to prevent chatter. If TS is set ON at 2%, for example, then
the valve begins to open when the setpoint reaches 2.5%.
Configuring TS ON
1. Press * to turn TS ON.
2. Press + to increase TS.
3. Press - to decrease TS.
4. Press * when finished to return to the CONFIG menu.
The CONFIG menu displays TS ON.
Turning TS OFF
1. Press * to turn TS OFF.
2. Press + to continue scrolling through the menu.
Changing Language
The local display language can be English or French.
1. Press * to toggle from ENGLISH to FRANCAIS.
2. Press + to continue to scroll through Config menu.